SMS or ConfigMgr 2007 Reporting installation fails after applying SMS 2003 SP2 or SP3 or ConfigMgr 2007 SP1
Here's another emerging issue we're starting to see so if you're having trouble installing Reporting then you'll want to check this out.
http://blogs.technet.com/smsandmom/archive/2008/07/23/sms-or-configmgr-2007-reporting-installation-fails-after-applying-sms-2003-sp2-or-sp3-or-configmgr-2007-sp1.aspx